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Promotional postcard of the first aerial demonstration of the American postal service by TWA, dated 26 September 1946 in Pittsburgh, Pennsylvania. It features a 3-cent stamp and a 5-cent stamp, as well as a special cancellation stamp 'First Flying Post Office' with an illustration of a TWA airplane. The address is intended for Bill Schneider, Jr., in New York, with the note 'VIA AIR MAIL'.